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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07bcf92390ced18f4e5b13c3cbe0e399aeb907caa51e48c236e99830da244f40' 
  AND token = 'eCQPWPJzOUrPsGJnq3kNIWP0c7OoFcqf85eNYIs8E5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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