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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c258ba9c0bfb70f912ff1b4c84e6cb70cf007e160d259a8fd5636f47a9ee2aa' 
  AND token = 'rsLNgLT8ymr7xJCmADGUuIauRorq6rzQv2tcrq+aFcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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