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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8cf7455f29ba70088c4a05bf2211db8d21788e0e177f605bfbb957c4f0f49a' 
  AND token = 'ci0QQLDmKs2s+adPvnGCaZol934MCTD7H1KjJytKGNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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