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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2398d87c6b0080aaa6afa7e2d00f894bc6cb0b1df7b366c5ca26a1cb4c763f' 
  AND token = '0xGYRmSyeI6psLuVBGDNdWuAW1R6nAh6dlA827+YY/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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