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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b1e3d09fad4c2351ea27b050e6f943b4b15ec86b548043d4795c61d808f5fc' 
  AND token = 'ZU9W80ulfTRhZlLrjcREUbjFsdLYkhlk9NX8rVpU3Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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