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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c29383676d33c4ff41c6c8b864c2a86c443a843f6cf71dd912c0861d16be1e' 
  AND token = 'Qhby1oyO81KqA6DGi+eoHYcFymJiQmkGwSzu6mKft5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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