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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0c733007522fed25a80c861c3da9abc19a698482b260e1313f97f3b6220295' 
  AND token = 'UUSifmnU0mK1tXVDGskef7JfYsvEfubE7jyVnOZJZPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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