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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa88bcf115600a1d6a01e63decf99495dda581230d5934f90a63f0a9e97af652' 
  AND token = 'TiBIeaSDYM4hWB1GWrhjAqLSnLOUfkQhCL2ZneQjYo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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