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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '992f30259c14d0a1e35ecb96519302ba9c5fbb1fae14247912788de1d7127e03' 
  AND token = 'YT1xA2ak2E2/6ihq7AjeFGxQGX6uhao5nc4MoaY+7wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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