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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5116395b5e8bbc11022f766e6881d4ecf070830adab532c933e08fdfc5879880' 
  AND token = 'SkdqQ2pd0CwMrxk+aCeshFZwEa/3NgFfWsYl2PF8SnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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