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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d1545414dadc825bd8a3e26a7201e95d44a9f96b52d840319328c160d3b3e5' 
  AND token = '4lIWpVL76ocQrCvhkxPNZ+TEFpO0DQ1NyNnk8OCrQQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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