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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5d1594fd467757ed9be28fb3d6eb92255121570a01d3f5cb52693ab3198c4b' 
  AND token = 'rahSwF0Jo9eUplMjNYSjuyQjj/zJMy2AY8KxAoZ7dis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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