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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b971c83ce8863e00a3aab52ededf265bb648920a20b8b6ce24eabdd5ce7cfad7' 
  AND token = 'mmYR8du0fv20S6dK4U3OOy1DMJ0aWlWFOmQ2vCXow+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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