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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ae8459343e5bde02e07e73b2f71ef47add955ca36d439d0c220d5aef5a6273' 
  AND token = 'dCZI3+SNPShLmHrS9TuBK02HM8x2Ybv1+eKVQmx+K14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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