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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1db0e7ec2d407441d6f2c3d2763dc3a900b8bbe6b46b624362cd447ffdf87ae' 
  AND token = '/OL+xkWsFyLNsgZgUPjq2k6aukmdjVYrixtFdsEvDnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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