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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff718abe5d19d4a4c6bb4af13fb2513ca0fe5e56d292006999e52955066d9368' 
  AND token = '/VaGojHE8Uv8FvnI9k2xPQfXWoV2zet0H7ka/GKEhCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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