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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f847ffb7392c06c125af9072649908163afa6adccd1b8b7e1333783e2aac82' 
  AND token = 'Hd6+bunGoRVE8T42AvkE8Zc9iH+pQNpZ983nT1/cMlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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