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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89895af9918f7f379602ff144d9ee94e34b1c6ebde990150981943b8423a2156' 
  AND token = 'dymuiblDvCbxzAUxKCVPNJuSnqSYEnxaQC9KvXqU/a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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