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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3844fdd308ded93b77f434911d799fcdba6fa7415389186127aa819a4b5568' 
  AND token = '09vYoo5jwcnyYG13S8UsGESHB7RZjLykI5Ly83Ck90g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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