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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af214d525f66f2d27e5b478ed911abe7c2bdef777d47afefd84c3779cd35bce9' 
  AND token = '4E4LQoUd+cQBXj+ohzs8iczgq2orFEgJl1q+DA81QPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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