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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ea388e5e6bd7b2a0bc8175c2d2aa3b67642647219f7716f2751fe4c1106ed3' 
  AND token = 'befeS3DsCIF+glojecIRqMz7g3lxTHBIXeKtjQLUue4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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