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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2807d7230fb596cb3a756fdcd0726656f59a839c6066abf3e23a7532012cb473' 
  AND token = 'RWF2Uyth+VFLVZmXrSeIGlrtd2Es8aEVS+DkCxuHGTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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