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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a81d9036c9cf5efd86ca7dbbdbe8e3ae25132214525d6aa7c34538d593a479d' 
  AND token = 'FnsnOinHno7nTh3Me2CIHXKVaA9LgELjts+TuVHt844=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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