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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd800870a87e2535fc206aeffc86ded687b987374a4324e053378f5149c0fa40e' 
  AND token = 'Ntw7JWsX3DJ0p1euvQQV70URanHECTbAVpuO7qpXzW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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