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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd5c9ad83ef7fb65385e7d22588cfffdcd3b57722eebcf37e47ab39c139a7be' 
  AND token = 'LJcvYvgIwC61dyE5h32NrSLFuzX24zSshQ+3shlLjec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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