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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9134dd087115a8a679521e31f658b3f75ca4ae19fc2860d7cd1d73c3bcba70a' 
  AND token = '4urjaYz+VOV/q4VoynzCvD3owi8dh08iOs7f+XnVCOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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