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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9aa4ea2c8739319be0b4392a01f0be9f587340702a6b303b697c02b12b8da9' 
  AND token = 'XNWmk3ZO1I1rIO9nv1nzqu5QULqfrStG+/n1RtufWCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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