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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73eaf77a8fc6abcd0707cc19e757a0e37b777c6d80217af95d2c9c021bde8669' 
  AND token = 'lojEhG+wHSEqea6B8mHAT+nYWL3XaoKHgAsGnl8xQLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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