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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47fb0657e9e9aeebc905bec4d0bd5146f7e5a5e170becf433d3aa68c8fe7c346' 
  AND token = 'gOSt+ozCSAvI0livCwME3r0UR/FJLNKhhE2Oy3rwpkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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