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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59bdb8d5ec6d4598ca21fb16092bc29a4a7a07a97161ebc2d3b5be182145427d' 
  AND token = 'bcsp6A0uy+uHWbdaHk7BGOHBCH2Y9oxMmh/uD6XPAQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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