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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a0d7fee1f448d6581f0c336bdd86dc3efa43f0744e9b8422d8afbe1b7f016a' 
  AND token = '+UYaibfK+a95Hpi7E4XPLvC1q96/V+3AcDlqmS9tvNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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