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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773ae524115c01fa7b4a9fd76a462d689eb2ced0da70d1ee701d24e9a757fd0d' 
  AND token = 'oL5F5sDBU78vKUWiQfkHixk/95u/EEjtIPT0W6VYal0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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