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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1973eb1e8196b31fe43139085a3c1edf430f596330c5eaf9c380b82d2b07c9' 
  AND token = 'iYzUXgIfDlcbT30sCMCKlNCdnjLzJ0X5teH6xmBkOPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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