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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0fe1ca0260959c41f10dd8691b0b6faff46903a3f9b74adcd20717141e8258' 
  AND token = 'bTAFXyq7MDvVcHqCZowJnv82eaNz7L9eRGQr6uFBucQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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