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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5862c38628a90ac3e00eb77b4448f73eb6c20e038c87fa557b837d7452b3e6' 
  AND token = 'KWoKHhJX2lFDYF0gbglqssk9Pbx93SikW3p3fekKkJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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