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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c52cdc50708f5b2d2f0d5af03df57f2c9d64537814794561aac067f39c2b507' 
  AND token = 'WsOX5UudTTOU/LDzioM9sH7jGUZyMje8xl5YSiFcWxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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