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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70696cb1e28c7a96068d9f9db56aaf60104e93311d5e9ab5e50e283196ada8c' 
  AND token = 'W6fO83c7e+oxqrYDZp7OJrxH/SeWHgTUav4F+PkHI9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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