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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd8618c33dd3d4329e7af736a5e8e51aa71280df30dc741f25b46d59dc1e188' 
  AND token = 'htmVxri1h3toYn464O9Mc1tkDXkbqI07fIXLltA1qFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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