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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced92857dc32b59fae22307e74077a54cbadcb86bf63a732f87b49b7a695c33a' 
  AND token = 'cc5gD/1lsBeaEDtO7iTUXa66DTYzOkYPgnvr+Mt75gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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