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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4538c494f3b0a88c323a8005eb7814bcc77f58d25cfdd2d3157eb886c8013db' 
  AND token = '55sex5pHFXEDmhGsBLJynR6gK3giTlnx7UZLswcKhV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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