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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87647163e08f4659725f2a523eb61d06d730e6844659e89ac62d47c01d3db596' 
  AND token = 'sSWPdoym3dh2bvQ3dToIi420nJE+RBGMgWchErsaoHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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