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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e2d456d401a943d3e192982cfd298c980d96aa8f22d194dd27b57ce983e9681' 
  AND token = 'EfYq3lmcRQU95vWTVWJHb80HhTPGiATatB6OkgmKrPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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