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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b51a73bb7dd20008b5b806fac6add59e4a85947181768a199b95b79b7c8ef61e' 
  AND token = 'amQowI5GjmI41nDde1CG9sIJI183MZ1uGAgcbXW5FJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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