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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2ef845efd397653a8da17bcd337157f8a6f104f1c4f3d31639f9688c125cba' 
  AND token = 'xo7j/Jz5OzziLu4YVDsaN4Lf/ansq4N5Vz5JeM491ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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