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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b7dc5af15190ef638161dfddde19c54c917e115283aee2b86bdd10d03fb4ef' 
  AND token = 'jWirv+t1s51VmtbF7JxnPpELMZxMyLTF+zS7kOnpLaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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