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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa3918d677371a8da0c664f677ec30c7e0209f746c406ed8afff6b57cc089c7' 
  AND token = 'oLMtkUpQtMr/8DOYYPeEDEsOJifKZfWywIk0LHHBpfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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