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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4860c637f8a7630d1f43c3c1e1b5ded863913e2fa6b83d99a45ab84d3afe7288' 
  AND token = '0ZAV/xwquR3yIc/ijHaNCeaoiRiJlLZp4/9qIrd7wG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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