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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62d9f1bfdd70107e2c935c960ae74d9a51244d4c1f1e546468c1c921965ed9d' 
  AND token = '/zSLxVWHV5DuHKvdbf5C+X4rA/1Pr4W/0JdcxfUbuZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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