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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb29ddecbc94099f270afee5d1d4d2844872193342b8c36b26a30a20ed459502' 
  AND token = 'ofOh9/2WtMjSBzochDNGWhs5Gj+CM1iTNFS5IEgcdWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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