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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee531436027b36ff796bf24876075b2f7c2eec1e259d7b173b1ece4446fe75d' 
  AND token = 'kFqLf5VyYVv/pFcEtwhsPbNxuaLkomq2tu6+RoKs4io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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