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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb45bea877939a283df5f81ff619c2f8a17958e7a5b96cf66f197d13f206a3b2' 
  AND token = 'doHDd83h+7kjosUIs5TiXvU1y6QecEr8h7BhKP5clm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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