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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168b9905427d10eb3da87103ef20bf8794f85fd4476413761af6c2d9c5f62b4d' 
  AND token = '4y+89GPcKBRQUBbMbFTSGXy06c53D5ShB6gicFp7Jzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}