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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08dde03bd341bc7934bb20570e0ed1518a8479a54ec67e105e442075c09ed461' 
  AND token = '708gr+8og9exwdKPwEKaDuNiY0HFcYA6WMgKL4mGCEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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