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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7738a879ca8cbf8e2e554dd2257ff214550bf8187968edd24dac22cccdad95a3' 
  AND token = 'xP86U96GSSzciUeh6JVvo/2HUMyUP9Y1WNF0sQKdzQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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