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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e561526460c907f36b1bb4ca643a7a2d0b192622313de4b348b06eedb8f6d4' 
  AND token = '+6SbK9N2kyKoN3ipXbzXEDWTqFkRilRV9j2CBmlwzXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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